H12-211-ENU 試験問題を無料オンラインアクセス

Which of the following are correct about the analysis of ICMP packets? (Multiple Choice)

• A.ICMP messages can record time, including original time, receiving time, and sending time.
• B.ICMP packets cannot be used to detect MTUs in a path.
• C.ICMP packets contain ICMP error packets, control packets, request/response packets, and refresh packets.
• D.ICMP protocol does not support redirection function
• E.ICMP packets are encapsulated in IP packets and are not encapsulated in the transport layer.

Which of the following is unlikely to be the IPv4 packet header length?

• A.20B
• B.64B
• C.60B
• D.32B

A network administrator has captured a data frame in the network with the destination MAC address of 01-00-5E-A0-B1-C3. The correct statement about this MAC address is ().

• A.It is a multicast MAC address
• B.It is a unicast MAC address
• C.It is a broadcast MAC address
• D.It is an illegal MAC address

What port number is used by the FTP protocol to control plane?

• A.23
• B.24
• C.21
• D.22

When a router forwards a packet, if it does not match the corresponding detail route and there is no default route, the router will discard the packet directly.

• A.True
• B.False